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Doetzer shared surveillance video with Pittsburgh's Action News 4 that shows Springer buying the Glock 19 that police say he used to kill his girlfriend, Chalalai Chaihirunkarn, at a North Oakland apartment.

Pennsylvania used to have a five-day waiting period for gun purchases. That went away in 1998. The state now does criminal background checks right at the time guns are being purchased.

Chaihirunkarn, 26, was a Ph.D. student at Carnegie Mellon University. Springer, 29, was an employee at the Software and Engineering Institute at CMU.

The couple was found dead Thursday by Pittsburgh police in an apartment at the Sherwood Towers on North Craig Street. Police have not said how long the pair was dead.

Cmdr. RaShall Brackney said police were called to assist the property manager in doing a well-being check on a renter who hadn't been heard from in a while.

After forcibly entering the apartment, police found Chaihirunkarn in the bedroom with multiple gunshot wounds. Springer appeared to have died from a gunshot wound to the head. There did not appear to be any signs of a struggle.

Brackney said both people were residents of the unit.

Residents of Sherwood Towers said the building is popular with CMU and University of Pittsburgh students, as well as older people.

Doetzer said he is sharing the surveillance video with Pittsburgh police.